diff --git a/src/backend/Sudoku.Infrastructure/Configuration/InfrastructureServiceCollectionExtensions.cs b/src/backend/Sudoku.Infrastructure/Configuration/InfrastructureServiceCollectionExtensions.cs
index 1c0f0b9..fc70291 100644
--- a/src/backend/Sudoku.Infrastructure/Configuration/InfrastructureServiceCollectionExtensions.cs
+++ b/src/backend/Sudoku.Infrastructure/Configuration/InfrastructureServiceCollectionExtensions.cs
@@ -46,7 +46,7 @@ private IServiceCollection AddCosmosDbServices(IConfiguration configuration)
 
                 var clientOptions = new CosmosClientOptions
                 {
-                    ConnectionMode = ConnectionMode.Gateway,
+                    ConnectionMode = ConnectionMode.Direct,
                     RequestTimeout = TimeSpan.FromSeconds(30),
                     MaxRetryAttemptsOnRateLimitedRequests = 3,
                     MaxRetryWaitTimeOnRateLimitedRequests = TimeSpan.FromSeconds(15)